SPN 1093 FMI 0Fuel
Fuel System 2 Pressure Too Low
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DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 1093 / FMI 0
Category
Fuel
Derate Risk
Possible
Regen Inhibit
No
Inducement Risk
No
Component Location: The high-pressure fuel pump is typically mounted on the engine block and driven by the camshaft or gear train.
Common Symptoms
- Engine derate or reduced power
- Hard starting or extended cranking
- Rough idle or engine stumbling
- Check engine light illuminated
- Loss of power under load
Root Causes
- Low fuel level or contaminated fuel Faulty fuel pressure regulator Worn or failing high-pressure fuel pump Restricted fuel filter or clogged fuel strainer Fuel system leak on low-pressure or high-pressure side
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Derate Behavior
Power Derate
Possible
System Interactions
SPN 1093 FMI 0 interacts with the following systems and may trigger cascading faults if not resolved promptly.
Common Diagnostic Mistakes
Replacing the sensor without verifying wiring continuity and supply voltage first.
Clearing codes without identifying and resolving the root cause — the fault will return.
Ignoring related active faults — cascading faults often share a root cause.
Skipping the connector inspection — corrosion and damaged pins are a leading cause of sensor faults.
Condemning the ECM before exhausting all wiring and component tests.
Related Faults in This Category
OEM System Resources
ASE Training Resources
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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 1093 FMI 0 — Full FSM Sequence & Repair Steps — includes wiring notes, sensor specs, and gated repair procedures.
Authority References
Diagnostic procedures on this page are informed by OEM service literature and industry standards.
Cummins QuickServe OnlineOfficial Cummins service manuals, fault code lookup, and TSB database.Detroit Diesel DiagnoCentralDetroit Diesel diagnostic procedures, DDDL documentation, and service literature.PACCAR MX Engine ServicePACCAR MX-11 and MX-13 engine service documentation and DAVIE diagnostic guides.Volvo/Mack Tech ToolVolvo and Mack engine fault code reference and PTT/Tech Tool diagnostic procedures.ASE — Diesel Truck Technician CertificationNational Institute for Automotive Service Excellence — T2 Diesel Engines certification standards.EPA Aftertreatment & Emissions GuidelinesU.S. EPA heavy-duty diesel aftertreatment compliance, DPF/SCR regulations, and NOx standards.
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